I had a company come in to clean our SummerAire oil furnace. He said the firepot was falling apart and that we needed a new furnace. I brought in another furnace company for a second opinion and and this inspector said the firepot was still fine and he was going to clear the furnace for use. He took out a piece of white insulation that was sitting in the firepot. He said the insulation has nothing to do with the safety of the firepot. So what are some opinions on this? Where did the white fireproof insulation come from?